Выражение встречается в следующем контексте:

Расписание курсантов Военно-морской академии:

A Midshipman’s Daily Schedule:
6:00 Personal Conditioning
7:00 Formation & Breakfast
8:00 1st - 4th Academic Periods
12:00 Formation & Lunch
14:00 5th – 6th Academic Periods
16:00 Athletic Period
18:00 Formation & Dinner
21:00 Academic Study Period

You can see that midshipmen accomplish more by lunch than most people accomplish all day. Our rigorous four-year program results in jam-packed schedules which begin as early as 5:30 am and last until 11:00 pm.
These schedules include morning and noon formations where information is passed and company business is conducted, morning and afternoon classes, varsity and intramural athletics and extracurricular activities, and mandatory study hour.
It’s a demanding schedule that provides many opportunities to grow morally, mentally and physically.

Я предполагаю, что это время, когда курсанты занимаются самостоятельно (выполняют домашние задания и т.п.)

Заранее большое спасибо.